钙盐及模拟干旱互作对大花套唇苣苔种子萌发和幼苗生长的影响  

Effects of calcium salt and simulated drought interaction on seed germination and seedling growth of Damrongia clarkeana

作　　者：洪欣 单皖粤 张丹丹 晁天彩 温放[3,4] 周守标 HONG Xin;SHAN Wanyue;ZHANG Dandan;CHAO Tiancai;WEN Fang;ZHOU Shoubiao(School of Resource and Environmental Engineering,Anhui University,Hefei 230601,China;School of Environmental Science and Engineering,Anhui Normal University,Wuhu 241002,Anhui,China;Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain,Guangxi Institute of Botany,Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences,Guilin 541006,Guangxi,China;Gesneriad Conservation Center of China(GCCC),Guilin Botanical Garden,Chinese Academy of Sciences,Guilin 541006,Guangxi,China)

机构地区：[1]安徽大学资源与环境工程学院,合肥230601 [2]安徽师范大学环境科学与工程学院,安徽芜湖241002 [3]广西壮族自治区中国科学院广西植物研究所,广西喀斯特植物保育与恢复生态学重点实验室,广西桂林541006 [4]中国科学院桂林植物园,中国苦苣苔科植物保育中心,广西桂林541006

出　　处：《广西植物》2020年第10期1457-1465,共9页Guihaia

基　　金：国家自然科学基金(31860047);安徽省自然科学基金(1908085QC1);广西喀斯特植物保育与恢复生态学重点实验室基金(19-050-6);广西自然科学基金(2017GXNSFAA198006)。

摘　　要：苦苣苔科原大花旋蒴苣苔(former Boea clarkeana Hemsl.)为我国特有的复苏植物,在最近的修订中被并入套唇苣苔属(Damrongia Kerr),更名为大花套唇苣苔[D. clarkeana (Hemsl.) C. Puglisi]。为了探究该植物对喀斯特特殊生境的适应机制,该文以大花套唇苣苔成熟种子为材料,通过观察钙盐和模拟干旱互作试验,研究了干旱和盐胁迫共同作用对其种子萌发和幼苗生长的影响。结果表明:钙盐及模拟干旱互作时,低浓度钙盐可减轻干旱对种子萌发和幼苗生长的抑制作用,且低程度的干旱与低浓度的钙盐相互作用时反而会促进种子萌发和幼苗生长;低钙盐低干旱复合条件对大花套唇苣苔生长的促进作用体现了该物种对喀斯特地区保水性差的石灰岩土壤基质的专适性,避免了和其他植物直接生态位的竞争。The former Boea clarkeana Hemsl.( Gesneriaceae) is a resurrection plant species endemic to China. In the recent revision,it was incorporated into Damrongia Kerr and renamed as D. clarkeana( Hemsl.) C. Puglisi. In this study,mature seeds of D. clarkeana were used as experimental materials to observe the effects of calcium salt and simulated drought interaction experiments on seed germination and seedling growth in order to explore the adaptation mechanism of the plant to special karst habitats. The results showed that when calcium salt and simulated drought interact,low concentration calcium salt can reduce the inhibition of drought on seed germination and seedling growth,and when low concentration drought interacts with low concentration calcium salt,seed germination and seedling growth will be promoted instead. The promotion effect of low calcium salt and low drought combined conditions on the growth of D. clarkeana also reflects the speciality of the species to limestone soil matrix with poor water retention in karst areas,and also avoids direct niche competition with other plants.

关 键 词：大花旋蒴苣苔 喀斯特地貌 模拟干旱胁迫 钙盐胁迫 幼苗生长 种子萌发 

分 类 号：Q945[生物学—植物学]